Telegraph sending and writing instrument



July 1, 1930. w. E. HARDING TELEGRAPH SENDING AND WRITING INSTRUMENT Original Filed June 19, 1926 3 Sheets-Sheet l gwmmntoz July 1, 1930. w. E. HARDING TELEGRAPH SENDING AND WRITING INSTRUMENT Original Filed June 19, 1926 5 Sheets-Sheet 2 July 1, 1930. w. E. HARDING 1,769,834

TELEGRAPH SENDING AND WRITING INSTRUMENT N Original Filed June 19, 1926. 3 Sheets-Sheet 3 gmuenioz WLUQM EHQEIDING Patented July 1, 1930 UNITED STATES PATENT OFFICE WILLIAM E. HARDING, OF INDIANAPOLIS, INDIANA, ASSIGNOR TO TELETYPE COR- PORATION, OF CHICAGO, ILLINOIS, A CORPORATION OF DELAWARE TELEGRAPH SENDING AND WRITING INSTRUMENT Application filed June 19, 1926, Serial No. 117,082. Renewed February 6, 1928.

My invention relates to telegraph sending and receiving instrumentalities; and more particularly to mechanisms of this kind in which key board operated sending devices,

and printing telegraph receiving instruments are used; and consists substantially in .the construction, combination and arrangement of parts hereinafter set forth and pointed out more particularly in the claims. An object of my invention is to provide in connection with such sending instrument, an improvement to prevent the inadvertent writing of one line upon another in the corresponding receiving instrument.

It is a primary object of my invention to provide a safety means for sending instruments of the class in which a certain key serves as the line feed key, and another key serves as the carriage return key, said safety means acting to automatically lock the remaining keys from operation when the carriage return key is operated; and a means acting to automatically unlock said remaining keys With the operating of the line feed key; for preventing the operator from writing a new line before the line feed key has also been operated.

It is a further object to provide 'a means to manually engage or disengage such locking means independently of the automatic manipulation of same, when desired.

In order to thus automatically lock and unlock the character keys in the finger board of a sending telegraph instrument, I have provided guide mounted ledge means below said keys, adapted to be moved, into or out of the path of same, for preventing or allowing operation thereof; and. a connection between said ledges, whereby they may be moved in unison to locking or unlocking position.

It is a further object to provide a slanting surface on said connection, under the carriage return key, whereby the normal carriage return movement of same will move said ledges to locking position, by the cam action of said surface, in contact with said carriage return key; and a corresponding slanting surface on said connection, under the line feed key, whereby normal line feedvention to provide an electro-magnet means for shifting said ledges and connecting means, said means having contacts for closing the energizing circuit of same, which are brought together by striking the carriage return ke and the circuit being correspondingly bro en by the line feed key.

lhe above and other objects are attained by the structure illustrated in the accompanying drawings, in which:

Figure 1 is a fragmentary plan view of a telegraph sending instrument with which my invention is embodied; Fig. 2 is a front fragmentary view of Fig. 1; Fig. 3 is a sectional view taken in the proximity of line 33 of Fig. 2; Fig. 4 is a Wiring diagram showing the hook-up for my electro-magnet key bar locking means, and also indicates mechanical structure of some of the parts; and Fig. 5 illustrates the electrical diagram of the telegraph sending instrument to which my invention has been conveniently added,

Similar characters of reference designate similar parts thruout the several views. ferring to Figure 1, the numeral 1 designates the main frame of the telegraph sending instrument, which is operated principally by means of the character writing keys 2.

As is understood by those familiar with the art, key board operated printing telegraph outfits are of at least two distinct kinds. In the kind shown, manipulation of the character keys 2 produces different sets of perforations along in the continuously fed telegraph tape 3, of correspondingly different code sending values, as will be understood.

Said tape is then run thru a code sending mechanism (not shown) which transmits Rei values, thru current carrying wires, to a corresponding telegraph writing instrument, at

the receiving station, and actuates the writing mechanism of same, usually in regular page formation.

In addition, however, to such tape using telegraph instruments, there is also commonly in use, key board operated sending instruments in connection with which, manipulation of the keys, transmits electrical impulses directly over the regular telegraph lines to corresponding telegraph Writing instruments, which, by means of electro-magnets thus brought into play in the writing instrument, causes same to write directly upon the page, by which provision, the use of the perforated tape is not required.

In view of the fact. that myv improvements may be used on either the tape using or direct sending telegraph instruments, of the finger board ty e. it is thought sufiicient to arbitrarily ll ustrate my invention in connection with the tape using sending mechanism, it being understorl that it may be readily applied to the direct sending,and other similar apparatus.

In the particular sending instrument shown, the writing keys 2 extend rearwardly thru a clearance opening 4'in the front wall of the main frame 1, and are pivoted within said frame near the rear wall 5 thereof. The bracket shaped levers 6 are likewise pivoted at points lower than said keys toward the left and right end walls 7 and 8 of said frame.

Said levers are of the reclining printing bracket shape, the normally vertical spans 9, of which. are disposed transversely along under said keys, in horizontal position, and form the power ends of said levers. Said bracket shaped levers are arranged successively in graduated sizes in relation to each other, and are nested together, one within the other. and pivoted in common at their left and right ends 10 and 11, respectively, by means of the two pivot pins 12 and 13, respectively, which are secured thru corresponding parts of the frame 1.

The selecting combs 14 are formed downwardly on the keys 2, each comb being constructed so as to make contact with a different combination of the lever spans 9.

The angle levers, 15, 16, 17 18, 19 and 20 stand in horizontal planes, and being arranged one over the other in order as stated are adapted to be pivoted upon a common vertical pivot 21. which is supported thru the floor 22 of the frame 1. The power ends 23, 24, 25, 26,27 and 28 of said angle levers are of. graduated lengths, they being shorter in downward succession. In accordance with this arrangement, the corresponding left ends 10 of the bracket levers 6 are extended upwardly from the pivot pin 12 thru the clear ance opening 29 of the frame floor 22, and

being of correspondingly graduated lengths the angle levers 15, 16, 17, 18, 19 and 20, re- I spectively, are disposed at substantially right angled formation with the power ends of said angle lev'ers,.and engage adjacent ends of the horizontal trigger arms 36, 37,38, 39, 40 and 41 at substantially right angles thereto. in free working relation therewith by which arrangement said angle levers serve to shift said trigger arms longitudinally.

A set of five independent tape perforating punches 42 are horizontally guided thru the stationary head 43, being arranged in a ver tical rowin relation to each other and transve'rsely to said trigger arms. The hammers 44 carried one each by said trigger arms face, one toward each of said punches, when-said triggers are held in working position, by means of the bracket levers 6 thru the aforesaid angle levers.

It will be obvious that operation of the character writing keys 2, will cause corresponding oscillation of the said angle levers, move the respective trigger arms longitudinally, and shift the said hammers out of line with the respective punches 42, andthus be positioned to miss same by manipulation of the aforesaid angle levers. The other ends of said punches are positioned to directly face the telegraph tape 3 as it is-fedfrom the roll 45 past the roller 46 and thence across the head 43; from whence it is fedthru the guide 47, as will be understood.

An electro-magnet operated hammer means 48 is mounted on the frame floor 22, having a driving bit 49 adapted to strike all of the aforesaid trigger arms simultaneously and directly, on the opposite side thereof .from

the punches 42.

The selecting combs 14 of the character writing keys 2 are so constructed that operation 'of any ofsaid character keys will cause oscillation of the angle lever 18. which carries the contact point means 50 and when the said angle lever 18 is at the end of its stroke, said contact means iscarried against the stationary contact point 51, and thereby completes the circuit for the electro-magnet hammer means 48, which drives the aforesaid trigger arms toward the punches 42. It will be understood that'the hammers 44 of the aforesaid trigger arms, which happen to have been left in line with the angle levers, unaffected by the particular selecting comb 14, brought into play by the operator, will be forced by' the driving bit 49, to punch a corresponding set of code sending holes in the tape 3, which is then fed along past said punches ready to be perforated again and is thus perforated ready to be used by the impulse sending mechanism (not shown).

I am awarethat the mechanisms such as described in the foregoing detailed explanations are neither new .nor novel, but are now in somewhat common use. Nevertheless it is thought appropriate to describe somewhat completely the old structure which I have chosen as a means of setting forth the use of my particular improvements, in order to amply establish the operativeness thereof.

The tape thus perforated is run thru said direct impulse sending mechanism from which different sets of impulses are transmitted over the regular telegraph lines to a page writing telegraph receivin instrument (not shown), to-which the di 'erent' sets of impulses cause ditferent characters to be Written on the platen of said receiving instrument in page formation.

When a certain number of characters and spaces have been thus printed to a line, itis necessary to return the platen carria e to the beginning position for a new line. i on this purpose one of the keys 52 is designated as the carriage return key, the pressing of which causes to be punched a certain combination of perforations in the tape 3, which actuates the carriage returning mechanism of the receiving instrument and causes same to be returned to line starting position:-

Before beginning to write a new line, however, it is, of course, necessary to rotate the platen (not shown) in the receiving instrument to avoid writing the new line on the preceding line, as is understood in connection with all page writing mechanism, such as type writers. For this purpose, I have also designated one of the keys 53 as the line feed key, the pressing ofwhich causes to be punched a certain other combination of perforations in the tape 3, and which causes operation of the platen rotating mechanism of said receiving instrument, and causes same to be sultabl rotated for beginning a new line.

ne of the most common mistakes in the operation of page telegraph sendin instruments of thischaracter, lies in the act that the operator very often forgets to press the line feed key before beginning a new line, in which instance, the new line is written right over the previously written line, rendering them both unreadable. It is principally to prevent such mistakes as this, that I have made the improvements which constitute my invention; my object being to automatically lock the character writing keys 2 against operation when the carriage return key 52 is pressed; so that it is impossible to begin writing the new line until the line feed key has also been pressed, the operation of same serving to automatically unlock the character writing keys.

As before indicated, entrance of the keys 2, 52 and 53 into the interior of themain frame 1 is made thru the front wall of said frame, the clearance opening 4 being provided for that purpose. Said opening is substantially closed, however, by means ofthe vertical plate 54, which has vertical slots 55, one each, to guide the said keys in corresponding vertical planes.

Along the lower front surface of said plate, parallel thereto, my new and novel plate-like lock bar 56 is provided in slidable relation thereto, which has notches 57 for giving clearance to said keys when pressed downward in working movement. Said lock bar is conveniently held in place by means of the headed screws 58 which slidably engage the horizontal slots 59 of same, and thread into the plate 54. The

slots 59 being longitudinally arranged in respect to said lock bar, allow longitudinal movement of same. Ledges 60 are formed between the notches 57 ad acent the character keys 2 which may be shifted in unison with said lock bar, oneeach under said character keys, and thus prevent operation of same, as shown in Fig.2.

The ledge 61 is likewise formed on the lock bar 56 adjacent the carriage return key 52.

"This ledge, however, has an upper surface 62 said lock bar is in key unlocking position,

which upon' striking said surface it serves to cam said lock bar to the left and likewise shift the ledges 60 under the character keys 2, thereby locking the same against operation.

Another cam acting ledge 63 is in like manner formed on the lock-bar 56 adjacent the line feed key 53, which stands directly under said line feed key in the working path thereof, when said lock bar is in key locking position. The surface 64 of the ledge 63 slants oppositely to the surface 62, and serves to cam the lock bar to the right, to unlocking position and the ledges 60 correspondingly out from under said character keys, and thereby unlgck same so that they may be freely operate It will therefore be understood that normal operation of the-carriage return key 52 will automatically lock the character keys 2 against operation, until the line feed key 53 .has been also operated, by which arrangement it will be impossible for the operator to make the very common error of starting to position upon operation of said line feed key. It is understood that my invention is operatable with either or both the mechanical or electro-magnet means.

Said electro-magnet means is constructed by supporting an electro-magnet on the main frame 1, in fixed manner, the poles 66.

of which electro-magnet, face codirectionally with the unlocking movement of the lock bar 56. An armature 67 oscillates upon the pivot 68 in a plane parallel to said lock bar, within close magnetic range of said poles, and its free end is coupled to said lock bar, by an adjustable bolt which engages said armature and also the bracket69 of said locking bar, in such manner that said lock bar may be shifted to locked position by said armature when same is attracted by said electro-magnet.

As a means for operating said electromagnet in conjunction with the carriage return key 52 and the line feed key 53, I have secured the insulating bracket 70 to the main frame 1, approximately under a halfway point between said carriage return key and said line feedkey. Upwardly from said insulating bracket, the brush 71 extends and bends sideways-under the said carriage return key, by which arrangement, normal downward working movement will bring same into contact with the bent portion of said brush, and by the resulting cam action, spring same sideways, correspondingly springing the circuit carrying spring 72, which stands approximately parallel to the brush 71, being located thereonto by means of the insulating spacers 73 and 74. -In like manner, a fixed contact support 75 is located onto said spring on the opposite side from said brush by means of the insulating spacer 76 by which arrangement, downward movement of the carriage return key 52 will spring the circuit carrying spring 72 with the brush 71, and bring said spring against the contact 77 of the contact support 75, which completes the circuit between the electro-magnet 65 and the current source 78, the current being transmitted in order as stated; from said source thru the conductor 79 to the junction 80, thence thru the'conductor 81 to the contact support 75, the contact 77 and to the spring 7 2, thence thru the conductor 82, the' juncture 83 and conductor 84, thence thru juncture 85 and conductor 86 to the electro-magnet coil 87, from whence the current is then directed by the conductor 88, the juncture 89, and the conductor 90 to the manual switch 91, and thence to said electrical source. Upon thus completing said circuit, the electro-magnet 65 is energized and draws the armature 67 toward same, and likewise the lock bar 56 to key locking position with the same effect as if cammed to locking position, by means of the slanting surface 62 by the carriage return key 52 as described above.

U wardly from the insulating bracket 70, the rush 92 also extends and. bends sideways under the line feed key 53, by which arrangement normal downward working movement will bring same into contact with the bent portion of said brush, and by the resulting cam action, spring same sideways correspondingly springing the circuit carrying spring 93, being located thereonto by means of the insulating spacers 94 and 95. In like manner a fixed contact support 96 is located onto said brush, by means of the insulating spacer 97, by which arrangement downward movement of the line feed key 53 will spring the circuit carrying spring 93 with the brush 92, and bring said spring against the contact 98 of the contact support 96, which completes a shunt circuit for the current source 78 by way of the conductor 79, the juncture 80, the conductor 99, the armature carried contact 100, the stationary contact 101, the conductor 102, the juncture 85, the conductor 84 the juncture 83, the conductor 103, the contact support 96, the contact 98, the contact spring 93, the conductor'104, the juncture89, and the conductor 90 to the switch 91 and thence to said current source, by which the electric magnet 65 being no longer energized, permits the contraction coil spring 105, which is tensioned between the lock bar ear 106 and a hole 107 in the frame 1 on the opposite side of said car from said electro-magnet by the slip pin 108,to-draw same from attracted position and at the same time, shift the lock bar 56 to unlocking position. It is understood, however, that said slip pin 108 is normally with- .drawn by the operator, to render the spring inactive, when depending upon the slanting surfaces 62 and 64 to operate the lock The contact screw 100 is secured in threaded relation with the armature 67, the nose of said screw facingthe contact point 101 which is thus supported by means of the bracket 109 of the electro-magnet 65. Said contact screw is adapted to be drawn against said contact point, when said armature is energized thru the above described operation of the carriage return key 52, and completes a self locking circuit collateral with the circuit closed by said return key, the current being'carried from the source 78 by the conductor 79 to the juncture 80, thence thru the conductor 99, the contact screw 100, the contact 101, the conductor 102, the juncture 85, the conductor 86, theelectro-magnet coil 87 the conductor 88, thejuncture 89, the con-.

ductor 90, and the switch 91 to said source.

It will be apparent that after the carriage re- I of the line feed key 53 however will cross.

the circuit thru the contact 77 is automatically broken, the electro-magnet will then be energized by the above described collateral locking circuit, and the lock bar 56, will be thus held in locking position after said carriage return key is released. Operation circuit the current source 78 in shuntrelation with said locking circuit and thereby render the electro-magnet 65 inactive, whereupon the lock bar 56 will then be drawn to unlocking position by means of the spring 105, by which a continued use of current from the source 7 8 is avoided.

Directly on the opposite side of the tape 3 from the punches 42, the die 110 is positionedwith cutting holes to receive said punches, which functionwith same in perfora'ting said tape, as will be understood by those familiar with the art. The space between the punch head 43 and said die is suitable to snugly guide the tape 3 as it travels past the punches 42.

The tape 3 is drawn from the roll 45 by means of the tape sprocket 111, which is pivoted thru the frame floor 22, and being pivoted on the opposite side of the punch guide 43 from said roll 45 serves at the same time to draw said tape along said punches, across the cutting face of the die 110. Said die extends to a position of relative tangency with said sprocket and serves to keep the tape in mesh with same, forming the tapeguide 47, aforementioned.

As before stated, the selecting combs 14 of the character writing keys 2 are so constructed, that operation of any of said character keys, will cause'oscillation of the angle lever 18. It is therefore obvious that the hammer of the corresponding trigger arm 39 would accordingly be shifted to normal non-punching position upon pressing of any of said character writing keys. I desire, however, to ac tuate the punch opposite the trigger arm 39 at each stroke of any of the character keys 2. In view of this, an extension 112 is provided on the hammer of the trigger arm 39, which actuates said punch when said trigger arm is shifted to normally non-punching position as compared to the other trigger arms. The extension '112 is therefore adapted to actuate a medial one of the punches 42, and

being brought into play at each character key stroke, will correspondingly punch a regular row of holes along a medial line of the tape 3, in line with the sprocket 111, and be adapted to mesh therewith, and pull said tape gradually along as it is thus perforated.

Between the floor 22 and the sprocket 111 the ratchet wheel 113 is concentrically secured to said sprocket. A hook pawl 114 extends rearwardly from a working position, in respect to the left of said ratchet wheel. Said pawl is pivoted in this position onto the bracket 115 which is formed on the driving bit 49 and extends transversely, and to the left, therefrom. By this arrangement it will be understood that the regular strokes of the electro-magnet hammer means 48 will actuate said pawl in longitudinal strokes and which serves at each revolution to strike the contact brush 121 and spring same against the contact means 122, being shown about to do so in Fig. 1 and thereby close the circuit of the signal light 123, wh'ch is disposed under the apron 124' which extends forwardly from the mainframe 1, under the 'keys2, 52 and 53; a hole 125 being provided in said apron for observing said light by the operator. 7

Now the spur gears 117 and 118 are of such sizes that a revolution of the gear 118 is just completed when a given line quantity of registrations have been punched in the tape 3 by operation of the character keys 2,

thereby actuate the tape sprocket 111-thru the 4 by which arrangement the brush 121, is 3613117"- ated whenever a length of tape has been perforated, having a printing value of one line in the receiving instrument. It will therefore be understoodthat when a predetermined line value length of the tape has been perforated, the light 123 will be illuminated and warn the operator that the carriage return key must be pressed, and also the line feed key. If, however, the operator forgets to operate the line feed key, the character writing keys 2 will be automatically locked against operation, as above explained. his understood that any other signal means may be-provided in place of'the light 123. For example, an electrically operated hell, or the equivalent. It is also understood, however, that my invention gnay operate without any such signal means whatever.

Referring to the lock bar 56, it is important that the amount of travel to locked or unlocked position should be somewhat definitely predetermined. The working movement of the keys 52 and 53, however, may vary slightly with different conditions or operators.- With these facts in view, it is more practical to make the slanting surfaces 62 and 64 of such angle and length that the shifting movement of said lock bar is well completed; at the same time permittingcontinued movement ofsaid keys without continued movesaid slanting surfaces are ended at their lower terminations to provide just sufficient working length in respect to their cam action against the keys 52 and 53 to accurately shift the locking bar 56 to locking and unlocking positions, allowing the-said keys to slide off of said ends and complete their downward strokes without imparting continued shifting movements-to said bar. It is understood, however, that the slots 59 of said lock bar are of such length as to properly stop the lock bar movement against the screws 58 in either direction.

Along under the keys 2, within the frame 1, the spring seat bar 126 extends transversely to said keys and is secured to the end walls 7 and 8, b means of the inwardly extending screws 1 7. Said bar contains holes 128, one being rovided under each of the keys 2, and said keys are each provided with downwardly openin notches 129. Hair springs 130 one for eac of said keys are exerted between the notches 129 and the corresponding holes 128 by which arrangement said hair springs return said keys to their upper or normal positions shown in Fig. 2 and Fig. 3, after the downward strokes thereof.

Referrin to Fig. 5, a wiring diagram is shown, il ustrating a conventional hook-up for operating the electro-magnet hammer means 48, in which the current is carried by means of the current supply 131, thru the conductor 132, to the juncture 133, thencethru the conductor 134 to the hammer means 48, thence thru the conductor 135 to the conthence thru the conductor 142 to'the contact 122, the brush 121, the conductor 143, the juncture 139, the conductor 140 to said source.

The aforesaid insulating bracket is secured to the inner side of the vertical plate 54 by means of the screw 144 said plate being in turn secured to the frame 1 by means of the screws 145.

The screw 146 engages the contact support 75, the insulating spacer 76, the circuit carrying spring 72, the brush 71, and is securely threaded into said insulating bracket and secures said parts together. In like manner the screw 147 engages the contact support 96, the insulating spacer 97, the circuit carrying spring 93, the brush 92 and is securely threaded into said insulating bracket.

There are some circumstances in which it is desirable to avoid the locking tendency of said lock bar, and for that reason I have attached an accessible handle 148 to same, by which it may be manually shifted to unlocked or locked position as desired," either cooperatingly or independently of the operation of the carriage return key 52 or the line feed key 53.

The electro-magnet 65 may be rendered inactive as desired by opening the manually operated switch 91, it being proper to also render the spring 105 inactive at the same time, by'conveniently withdrawing the slip pin 108, under which condition, operation of the lock bar 56 is dependent entirely upon the cam action of the surfaces 62 and 64 against the keys 52 and 53. It is also understood however, that a telegraph sending device may be provided with neither, either or both the cam actuating means or the electro-magnet means of operating said locking bar.

The mechanism is operated thru the spacer key 149 to register the usual spacing values between letters or words on the tape 3.

The contact means 122 and the contact brush 121 are supported by the insulating block 150, which is disposed between, and secured to same by means of the rivet 151. The block 150 is secured to the under surface of the frame floor 22 by means of the screw 152.

For the purpose of stabilizing the locking and unlocking movements of the lock bar 56, I-have provided a bowed spring 153, of flat material, the ends of which frictionally embrace said bar under tension of the screw 154 which engages said spring at a medial point thereof and passes thru said bar and engages the key guide bar 54. A slot (not shown) similar to slots 59 is provided in said lock bar to allow ample movement of same. Said bow spring steadies the lock' bar movements by the brake effect upon same, prevents dangling of said bar on the screws 58, and also prevents the unintentional movement-s ofsame.

The bolt which couples the'lock bar bracket 69 with the armature 67, before mentioned, is designated by the numeral 155.

The contact point 51, is adjustably supported integrally on the nose of the screw means 156, said screw means being threaded thru the bracket 157 which is integrally mounted on the frame floor 22. The electromagnet hammer 48, the punch guide head 43,

the die 110, the pivot support for the roller 46, and the pivot 158 of the tape roll 45 are also, all integrally mounted on said frame floor.

Attention is called to the fact that Fig. 4

fragmentarilv shows the lock bar 56 in un- 1 it is evidentthat many modifications may be made in the various details, without departing from the scope of the appended claims, vit being understood that my invention is not restricted to'the particular forms herein described. a

I claim as my invention:

1. In tape telegraph sending instruments having character sending keys, a carriage return key, a line feed key and a means to register sending values on the tape thru operation of such keys; a slidably supp terl ledge means adapted to be slid under the character writing keys for obstructing same, said ledge means having a cam surface in the working path of the carriage return key, serving to cam said ledge means under said character sending keys, by contact of said carriage return key, whereby the character keys are locked, said ledge means having another cam surface in the working path of the line feed key serving to cam said ledgemeans from under said character writing keys by contact of said line feed key; whereby oper-- ation of the carriage return will lock said character writing keys, and operation of the line feed key will unlock same; to prevent the registration of character values on said tape until the line feed value has been registered on'same.

2. In telegraph sending instruments having character sending keys, a carriage return key, anda'line feed key; a movably supported -ledge means adapted to be moved under the character writing keys for obstructing same; a means serving to move said ledge means under said character sendlng keys, by operation of said carriage return key, whereby said character sending keys are locked; and another means serving to move said ledge means from under said character writin g keys by op'eration of the line feed key; whereby operation of the carriage return key will lock said character writing keys, and operation of the line feed key will unlock same; to prevent the writing of one lineon another.

3. Intelegraph sending instruments having character sending keys, a carriage return key, and a line feed key and a means to register sending values on the tape thru operation of such keys; a means to automatically lock the character writingkeys, operated by the carriage return key; and a means to automatically unlock same, operated byothe line feed key to prevent the receiving instrument from writingone line upon. another.

4. 'In tape telegraph sending instruments having character sending keys, a carriage re-. turn key, a line feed key, and a means to register sending values on the tape thru operation of such keys; a slidably supported ledge means adapted to be slid under the characterwriting keys for locking same; and an electro-magnet, the energizing circuit of which is automatically closed by operation of the carriage return key, said electro-magnet serving to attract said ledge means to looking position, under said character sending keys, when energized, whereby they are locked against operation; to prevent the registration of character values of said tape after a reading line ofvalues have been registered on said tape.

5. In telegraph sending instruments having character sending keys, a carriage return key, and a line feed key; an electromagnet means to automatically lock the character writing keys, automatically brought into place by the carriage return key; and a means to automatically unlock same, operated by the line feed key to prevent more than a line value of combined strokes by said character writing keys, without operation of the line feed key.

6. In telegraph sending instruments having a carriage return key means, a line feed key means, and another key means; a movablysupported ledge means adapted to be moved under said other key means for obstructing vsame; a means serving to automatically move said ledge means under said other key means, by operation of said carriage return key means, whereby said other key means are locked; and another means serving to automatically move said ledge means from under said other key means by operation of'the line feed key means; whereby operation of the carriage return key means will lock said other key means, and operation of the line feed key means will unlock same. l

7. Intelegraph sending instruments hav ing a carriage return key means, aline feed key means, and other key means; a movably supported ledge means adapted to be moved means will unlock same; to prevent the writing of one line on another.

8. In telegraph sending instruments having character sending keys, a carriage return key, and a line feed key; a movably supported ledge means adapted to be moved ,under the character Writing keys for locking same; a source of electrical current supply; an electro-magnet serving to attract said ledge means to locking position, the energizing circuit of said electro-magnet being automatically closed with said supply by operation of the'carriage return key, whereby the character keys are locked; another means tending to move said ledge means to unlocking position in opposition to said electromagnet means; a cross circuit means for said source adapted to be automatically closed by 0 ration of said line feed key, to render said e ectro-magnet inactive, whereby operation of the carriage return key will lock said character writing keys, and operation of the line feed key will unlock same; to prevent the writing of one line on another in the receiving instrument; and a set of circuit making contact points forming a part of a circuit collateral to said energizing circuit, and automatieally held together by said ledge means in its attracted position, whereby activity of said electro-magnet is maintained after said carriage return key is released, until said cross circuit is closed.

9. In a telegraph transmitter, means for transmitting code combinations of impulses for printing operations, means for transmitting a code combination of impulses for performing a carriage return operation, and means responsive to said last mentioned means for positively rendering said first mentioned means non-operative.

10. In a telegraph transmitter, means for transmitting code combinations of impulses for performing printing operations, means for transmitting a code combination of impulses for performing a carriage return operation, means responsive to the last mentioned means for rendering said first mentioned means nonoperative, and means for transmitting code combinations of impulses for line feeding, said means also rendering said first mentioned means operative again.

11. In a telegraph transmitter, a plurality of key bars, means responsive to the operation of said bars for transmitting code combinations of printing impulses, a key bar, means responsive thereto for transmitting a carriage return combination of impulses, another key bar, means responsive thereto for transmitting a line feed code combination of impulses, means operative in response to the operation of said carriage return bar for rendering said printing bars non-operative, said means being operative in response to the operation of. said line feed bar for rendering said printing bars again operative.

12. In a telegraph transmitter, a plurality of key bars, a'stunt key bar, means responsive to the operation of said stunt key bar for rendering said plurality of key bars non-operative, means for thereafter maintaining said key bars in a non-operative condition independently of said stunt bar, a sec ond stunt bar and means responsive to the operation of said second stunt bar for rendering said key bars operative.

13. A keyboard comprising a plurality of key levers, means responsive to the operation of said levers for transmitting code combinations of impulses and means for positive- .positively rendering said levers non-operative and manually controlled means for changing said condition to render said levers operative.

15. In a telegraph transmitter, a plurality of key levers, a tape, means responsive to the operation of said key levers for perforating said tape for transmitting code combinations of impulses, means for locking said key bars to prevent further perforation of said type and manually controlled means for releasing said key levers for operation.

16. A key board comprising a plurality of key levers, a locking bar having a plurality of positions in one of which said type key levers are held from operation, and means responsive to a partial operation of one of said levers for operating said locking bar to said one position to hold said other key levers from operating and spring means for maintaining said bar in operative position.

17. A key board comprising a plurality of transmitter levers, a lock bar having a plurality of positions, in one of which said levers are locked from operation, and a cam member on said lock bar cooperating with one of said levers whereby said lock bar is moved to lock said other bars in response to the partial operation of said lever.

18. In a telegraph transmitter, a plurality of transmitter levers, a lock bar having a plurality of positions in one of which said levers are locked from operation, a cam member on said lock bar cooperating with one of said levers whereby said lock bar is moved to lock said other bars in response to the partial operation of said lever, a second cam on said lock bar cooperating with another of said levers whereby said lock bar is moved to release said levers in response to the partial operation of said second lever.

19. A keyboard, comprising a plurality of key levers, means for transmitting telegraph signals controlled by said key levers, a locking bar mounted on said keyboard having a plurality of positions, and means for moving said locking bar longitudinally to one of said positions to lock said levers against operations, said locking bar being operable to another of its positions to release said levers for operation.

20. A keyboard, comprising a plurality of key levers for transmitting telegraph signals controlled by said key levers, a locking bar having a ledge mounted under said key levers, said locking bar having notches cut therein and being movable to a plurality of positions, in one of which positions said notches are under said key levers whereby said key levers are free to operate and in another of said positions said bar presents its ledge under said key levers whereby said levers are locked from operation;

21. A keyboard comprising a plurality of key levers, means for transmitting telegraph signals controlled by said key levers, a locking bar mounted on said key board, said look ing bar having a plurality of normal positions in one of which said key levers are locked from operation, in the other of which said key levers are free to operate.

22. A key board comprising a plurality of levers, means controlled by said key levers, for transmitting code combinations of telegraph signals, a locking bar mounted in operative relation with said key levers, said locking bar having a plurality of positions in one'of which said key levers are locked from operation and in another of which said v levers are released for operation and a key lever in operative relation with said locking bar for operating it to one of its positions.

23. A key board comprising a plurality of levers, means controlled by said key levers for transmitting code combinations of telegraph signals, a locking bar mounted in operative relation with said key levers, said locking bar having a plurality of positions in one of which said levers are locked from operation and in another of which said levers are released for operation and means'including certain of said key levers for directly controlling the .movement of said locking bar to its plurality of positions.

24. A key board comprising a plurality'of key levers, means controlled by said key lever's for transmitting code combinations 0 signals, a locking bar mounted in operative relation with said key levers, having a plurality of normal positions, manually controlled means for operating said locking bar to one of its positions, for lockingsaid key levers from operation and-manually controlled means for .operating said locking bar to another one of its positions, for releasing said key levers for operation.

25. A key board, comprising a plurality of key levers, means controlled by said key levers for positively rendering said key levers nonoperative for an indefinite period of time.

27. A key board comprising a plurality of I key le'vers, permutation means responsive to the operation of said levers for transmitting ing said key bars to prevent further perforations of said tape and manually controlled means'for releasing said key levers for operation.

In testimony whereof, I have hereunto set my hand on this the 12th day of June, 1926, A. D.

WILLIAM E.- HARDING.-

for transmitting code combinations of impulses. means responsive to a predetermined condition obtained in accordance with code I combinations of impulses transmitted for rendering a lever non-operative, means operative in accordance with code combinations of impulses transmitted for changing said condition and means responsive to said change in condition for rendering said leveroperative again.

26. prising a plurality of key levers, means responsive to operation of said levers for trans mitting code, combinations of impulses and locking means associated with said key levers A signalling system, a key .board oom 

